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Registered Member #4603
Joined: Wed Apr 25 2012, 07:33PM
Location: Austria
Posts: 159
Hi guys! My new project... I had 2 UI cores laying around. I made a big one out them. I glued the 2 Is on one U. So i have 1 large U and one small U -> giving me one big core Secondary coil is a 5cm pipe with 600 turns 0,3mm wire. The transformer is driven by a 300A 1200V IGBT halfbridge. Smoothed with 10.000µF xD At the output i got a voltage doubler consisting of 2 x 4nF 40kV capacitors and 2 HV diodes stored under oil.
I can draw 35cm Arcs and the power consumption is 230V~ 15A. Enjoy!
Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
daymn, that is some huge arcs, where did you get the ferrite from?
what kind of driver is it? just a TL494, ->driver -> GDT -> Brick?
and also, are you planning to make a full bridge version of it too? mabye audio modulate it... that would be cool! whay kind of voltage is that about your getting out? about 16.2Kv if i did the calculation correctly (320/2)/10 = 16v/turn 16*600 = 9600 9600*2 = 16,200v
Registered Member #4603
Joined: Wed Apr 25 2012, 07:33PM
Location: Austria
Posts: 159
Thanks, __=|(:3)-|--{__ !
I got that ferrite form a huge choke which i got from a friend. Yes, just a driver and a GDT. Exactly: oscillator -> Mosfet driver - small GDT -> Mosfet half bridge (70V) - large GDT (18V) -> IGBT halfbridge. Full bridge!? It already draws 3kW with the half bridge! Can´t go higher ^^ Maybe i will modulate it, yes. I don´t know if you can calculate it this way. When there is the right frequency on the secondary coil it gets in resonance increasing the output - so there is maybe more than 16.2kV. But you could be right! I got a doubler at the output so there will be about 30kV. It ark's over at about 3cm. If 1mm = 1kV it could fit!
EDIT: OK you already multiplied it by 2... But it looks like there is more voltage at the output than 16kV.
Thanks, Steve! I twisted the blue cables!
I found something that reduced the power. A steel washer between the blue cable and the IGBT. You may not believe it but the output increased noticeable when i removed the washer...
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Yep, you can't have any ferrous metal in the current path. It causes huge losses and gets dangerously hot. Copper, brass or non-magnetic stainless only!
You can get away with ordinary steel bolts for the terminals, as long as there's another path for the current to go around the bolt and not through it.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Hehe, cool arcs, but I'm surprised the little PVC-wire primary doesn't melt after a while And be sure to add some RF-bypass capacitor across the IGBT input terminals.
Registered Member #4603
Joined: Wed Apr 25 2012, 07:33PM
Location: Austria
Posts: 159
You are right Steve! I found it out by myself xD Now the steel screw just pushes down the copper cable to the IGBT terminal.
__=|(:3)-|--{__ I could ask some people form a German forum. Some of them ordered big cores for far under 100$.
The primary gets barely warm. I am also surprised, Dr. Dark Current. The only thing that is getting pretty hot is the Diode (multi mini diode) Some kind of Snubber? Ok i will attach that!
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3kW IGBT Halfbridge Inverter *UPDATE 5kW*
Can´t go higher ^^
And be sure to add some RF-bypass capacitor across the IGBT input terminals.
